Hypodermic syringe for injecting liquids into the body or for taking them therefrom



lastima*` F. MEYER June 24, 1930.

HYPODERMIC SYRINGE FOR INJECTING LIQUIDS INTO THE BODY OR FOR TAKING THEM THEREFROM Filed nov. '7,- `1924 Patented .lune 24, 1930 UNITED STATES PATENT OFFICE FELX MEYER, OF AACHE, GERMQNY EYPODERMIC SYRINGE FOR INJECTING LIQUIDS INTO THE BODY OR FOR TALKING- THEM THEREFROM Application led November 7, 1924, Serial4 No. 748,390, land injGermany July 29, 1924.

This invention relates in general to hypodermic syringes and more particularly to syringes for storing liquids or gases which are to be injected into the body of a human being 5 or animal or to be taken therefrom, the syringe being of the kind in which a container is closed up by an indiarubber or like stopper, and a guide tube carried bythe stopper.

According to the present invention the syringe'is provided with an elastic stopper and acannula carried by and passing through thev said stopper and extending into the interior of the syringe, the'part of the cannula projecting therein being opened or closed with respect thereto by moving the stopper from the outside.

The substance with which the syringe is charged, is under pressure or the syringe contains a vacuum according as to whether the @2o fluid is to be injected into the body or Asubstance to be drawn therefrom. The injecting into and the drawing from the body is effectedwith the aid of a cannula which is inserted into an existing aperture or into an opening to be produced. In the latter case the cannula is fitted with a hollow metal needle preferably fused together therewith. The

syringe is closed by a stopper consisting of rubber or of another suitable elastic material which serves as a holder for the cannula.

This cannula projects partly outside and partly inside the syringe. The part projecting into the syringe is separated from the interior of the syringe by a lid or casing which is only opened when the syringe is to be applied. The opening is effected from the outside by moving the elastic stopper either d1- rectly, for instance by pressing, pulling or twisting the saine, or by moving the cannula. By opening the cannula a connection 1s established between the interior of the syringe and that of the cannula. In order to be able to interrupt the operation, the arrangement is such as to allow the said connection to open and close at will by moving the stopper or the cannula. The part of the cannula projecting intol the interior of Lthe syringe may be shaped in such a manner that, when in a state of rest, it presses with its opening so 50 firmly against the elasticstopper, that the opening is thereby closed. By exerting a' lateral pressure directly on to the part of the stopper .projecting outside the syringe or; on to the outer projecting part of the cannula, the opening of its part projecting into the syringe is forced away from the rubber stopper and is closed again when the pressure is released. The cannula is provided with a needle so that when the latter is driven into a blood vessel for instance into a stopped vein, blood will enter into the cannula, the quantity and colour of the blood that has penetrated therein allowing anV opinion to be formed as to whether a certain kind of blood vessel has been struck or not. i The inner part of the cannula may beso constructed that it is normally completely closed, "an opening being produced therein by a portion of the said inner part of the cannula being broken off, such breaking being caused also by moving the stopper or the outer part of the cannula. Also in this case the part of the cannula projecting into the syringe may be so constructed that the opening of the remaining part of the cannula bears against an elastic cover which closes the opening w,hen the stopper is in a certain position.

The invention is illustrated by way of example in the accompanying drawing, in which v Figure 1 shows a syringe for injecting fluids into an existing or natural opening of the body..

Figure 2 shows a modication of the v'syringe shown in Figure 1 for injecting liquids into the tissue of the body.

Figure 3 shows a syringe provided with means for collecting blood.

Figures 4, 5, 6 and 7 show furtherl embodi- 9S ments of the syringe according to the invenkchamber H3 into which the blood can enter and which forms the indicating device hereinbefore described. The cannula also has a lateral open extension which can be closed and opened with respect to the interior of the syringe as hereinbefore described.

The hollow chamber H3 forming the indicating device may however be so arranged as to follow directly the hollow needle and to extend partly outside the syringe for instance between the outer end of the stopperI and the hollow needle. This modification which is illustrated in Figure 4 and in which K4 is the cannula, H4 the hollow chamber, F4 the stopper and N4 the hollow needle, is of special advantage, when an opaque injecting liquid is used through which the blood cannot be seen. j

1n Figure 5 the cannula K5 within the syringe is completely closed and is broken i at a certain weak point by moving the stopper P5 so that the end of the cannula K5 is pressed against the inner wall of the syringe.

1n Figure 6 the cannula. K6 is so shaped that after it has been broken at a weak point in the manner described with reference to Figure 5, the opening that is thereby left i in the cannula may be closed from the outside by pressing the cannula against the inner wall of the stopper P6. M

flhe invention also relates to a simple process for evacuating syringes of the kind above described or for filling them with liquids or gases under pressure. For this urpose a hollow needle lF as ,shown in Figures 4. and 7 is passed through the stopper P7 until its end projects `into the interior of the syringe. This hollow needle F is con- .chamber terminating the cannula, and

matically closes at the point where it has been pierced.

Claims: l y

1. A syringe for injecting a gaseous or liquid fluid into the body of a human being or animal 'or for drawing it therefrom comprising a container, a stopper closing the container, and a cannula carried by and passing through the said stopper, the stopper being made of elastic material and the said cannula extending in the interior ofthe container in such a manner that normally the communication between'it and the interior of the container is closed and when the stopper is moved fromthe outside communication is caused to be established between the cannulal and the container.

2. A syringe as claimed.y in claim 1 and in which the part'of the cannula inside the container 'has an opening held pressed against a part of the elastic stopper,l within the container, as and for the purpose set forth.

3. A syringe as claimed in claim 1, having a hollow needle within the cannula as and for the purpose set forth.

4. A syringe as claimed in claim 1, having a hollow needle within the cannula, an air an open lateral extension provided on the vcannula and held pressed against an elastic part of the stopper, as and for the purpose set forth. l 5. A syringe as claimed in claim 1, having a hollow needle within the cannula,'an air chamber constitutedby a portion of the cannula extending beyond the portion con-v taining the needle and an open lateral exla constituting the lair chamber and held pressed against an elastic part of thestopper, as and for the purpose set forth.

In testimony whereof I aiiiX my signature.

FELIX MEYER. j

ne'cted at its other erid to a gas or liquid supply'. 'The gas contained in the closed syringe,

is either drawn ofll through the hollow needle F so that a vacuum is producedtherein, or

the gas is driven into the syringe by pressure so that the4 latter contains ycompressed gas,`

or a liquid is forced into the syringe through I the needle F, whereby the gas in the syringe is compressed, so\ that when thecannula K7 is subsequently opened to the inteiriorof the syringe the gas, in consequence of its expansion forces the liquid outr of the syringe again. After 'the syringe has been evacu'I ated or filled, the hollow needle F is vpulled out whereupon therubber stopper P7 autotension provided on the portion of the cannu: 

